The CIIL through its programme has worked in 75 tribal and border languages and has prepared different kinds of linguistic material like grammars, phonetic readers, primers, etc.
El CIIL, a través de su programa, ha trabajado en 75 idiomas tribales y fronterizos y ha preparado diferentes clases de materiales lingüísticos como gramáticas, lectores fonéticos, cartillas, silabarios, etc.